MY COLLEAGUE MAURICE STUCKE, IN THE HARVARD BUSINESS REVIEW: Here Are All the Reasons It’s a Bad Idea to Let a Few Tech Companies Monopolize Our Data.

“It’s no good fighting an election campaign on the facts,” Cambridge Analytica’s managing director told an undercover reporter, “because actually it’s all about emotion.” To target U.S. voters and appeal to their hopes, neuroses, and fears, the political consulting firm needed to train its algorithm to predict and map personality traits. That required lots of personal data. So, to build these psychographic profiles, Cambridge Analytica enlisted a Cambridge University professor, whose app collected data on about 50 million Facebook users and their friends. Facebook, at that time, allowed app developers to collect this personal data. Facebook argued that Cambridge Analytica and the professor violated its data polices. But this was not the first time its policies were violated. Nor is it likely to be the last.

This scandal came on the heels of Russia’s using Facebook, Google, and Twitter “to sow discord in the U.S. political system, including the 2016 U.S. presidential election.” It heightened concerns over today’s tech giants and the influence they have.

That influence comes in part from data. Facebook, Google, Amazon, and similar companies are “data-opolies.” By that I mean companies that control a key platform which, like a coral reef, attracts to its ecosystem users, sellers, advertisers, software developers, apps, and accessory makers. Apple and Google, for example, each control a popular mobile phone operating system platform (and key apps on that platform), Amazon controls the largest online merchant platform, and Facebook controls the largest social network platform. Through their leading platforms, a significant volume and variety of personal data flows. The velocity in acquiring and exploiting this personal data can help these companies obtain significant market power.

Is it OK for a few firms to possess so much data and thereby wield so much power? In the U.S., at least, antitrust officials so far seem ambivalent about these data-opolies. They’re free, the thinking goes, so what’s the harm? But that reasoning is misguided. Data-opolies pose tremendous risks, for consumers, workers, competition, and the overall health of our democracy. Here’s why.

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